Reference
Dahl, T.E. 1990. Wetland losses in the United States 1780's to 1980's. US Department of Interior, Fish and Wildlife Service, Washington, DC. 13 p.
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Trettin, C.C., Aust, W.M. & Wisniewski, J. Preface. Water Air Soil Pollut 77, ix (1994). https://doi.org/10.1007/BF00478416
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DOI: https://doi.org/10.1007/BF00478416